US5842742A - Mechanism for preventing the shaking of a drum chair - Google Patents

Mechanism for preventing the shaking of a drum chair Download PDF

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Publication number
US5842742A
US5842742A US08/779,169 US77916997A US5842742A US 5842742 A US5842742 A US 5842742A US 77916997 A US77916997 A US 77916997A US 5842742 A US5842742 A US 5842742A
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United States
Prior art keywords
chair
support
upper support
holder
lower support
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Expired - Lifetime
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US08/779,169
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English (en)
Inventor
Yoshihiro Hoshino
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Hoshino Gakki Co Ltd
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Hoshino Gakki Co Ltd
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Assigned to HOSHINO GAKKI KABUSHIKI KAISHA, A CORP. OF JAPAN reassignment HOSHINO GAKKI KABUSHIKI KAISHA, A CORP. OF JAPAN ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: HOSHINO, YOSHIHIRO
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    • A—HUMAN NECESSITIES
    • A47—FURNITURE; DOMESTIC ARTICLES OR APPLIANCES; COFFEE MILLS; SPICE MILLS; SUCTION CLEANERS IN GENERAL
    • A47C—CHAIRS; SOFAS; BEDS
    • A47C9/00—Stools for specified purposes
    • A47C9/08—Music stools

Definitions

  • the present invention relates to a mechanism for preventing shaking of a chair, particularly a drum chair, which may occur, for example, while playing a drum.
  • FIG. 10 hereof shows an example of a known chair 60 for use when playing a drum.
  • the chair 60 comprises a seat 61 and a lower support 70.
  • the seat 61 includes a cushion arranged on the upper surface of the seat plate 62.
  • the cushion is covered by a suitable surface material 63.
  • the cushion is held by an upper support 64 located on the lower surface of the seat plate 62.
  • the upper support is an externally profiled cylinder which is inserted into the lower support 70 and is fixed to it.
  • the lower support 70 has a leg section 80 comprised of a plurality of legs 81.
  • the tops of the legs are pivoted to the lower side of the tubular installation part 73 of the lower support 70 to swing relative to that support.
  • the lower end regions of the legs are pivotally connected to the lower end of the lower support 70 through an annular installation body 82 which is freely slidingly installed on and along lower support 70.
  • a tightening bolt 72 fixes the annular installation body 82 along the lower support 70.
  • the lower support 70 includes an inner tube 71 into which the upper support 64 is inserted.
  • An installation tubular part 73 at the top of the inner tube part 71 has an internal screw thread 74 engaged with the spiral thread 65 of the upper support.
  • the seat 61 is rotated either to the right or to the left to adjust the length of the upper support 64 that extends from the inner tube 71 of the lower support 70 for adjusting the height of the chair.
  • a tightening bolt 66 determines the adjusted length of the upper support 64.
  • an installation tubular part 68 into which the top of the upper support 64 is inserted, is disposed on the reverse side or underside of and approximately at the center of the seat plate 62 for receiving the top of the upper support 64 inserted into it in a detachable manner.
  • a screw hole 68a opens into the side of the installation tubular part 68.
  • the invention provides a mechanism for preventing shaking or vibration of a chair, and particularly a drum chair, and for preventing loosening of the seat and upper support and loosening of the top and bottom supports in the chair, which could result from vibrations during a performance.
  • the invention relates to a mechanism for preventing shaking of a drum chair, wherein an upper support that holds a seat plate is fixed to a lower support that is equipped with the chair legs.
  • the lower support includes an inner tube in which the body of the upper support is inserted.
  • the upper support is held freely detachably, as it is held from both lateral sides by a holder.
  • a first screw on the fixed side of the holder and a second screw on the opposite tightening side of the holder clamps the holder at its top to the upper support receiving part that is provided on the underside of the seat plate.
  • a shaking prevention bush has a compression part that presses against the inner surface of the inner tubular part of the lower support. That bush is fixed at the lower part of the upper support.
  • FIG. 1 is a front view of an embodiment of a drum chair having a mechanism according to the invention.
  • FIG. 2 is a side view of the upper support receiving part.
  • FIG. 3 is a cross section along line 3--3 in FIG. 2.
  • FIG. 4 is a cross section along line 4--4 in FIG. 2.
  • FIG. 5 is a plan view of the underside of the seat plate.
  • FIG. 6 is a longitudinal section through part of the chair in FIG. 1.
  • FIG. 7 is a cross section through a fragment of what is shown in FIG. 6 with its essential part expanded.
  • FIG. 8 is a side view of a shaking prevention bush.
  • FIG. 9 is a cross section along line 9--9 in FIG. 6.
  • FIG. 10 is a front view of an embodiment of a prior art drum chair.
  • FIG. 11 is a cross section of a fragment of FIG. 10 showing the structure for fixing the upper support to the lower support.
  • FIG. 12 is a cross section showing the fixed structure of the seat and the upper support in the construction shown in FIG. 10.
  • FIG. 1 shows a drum chair 10 having the mechanism according to the invention. It is comprised of a seat part 11 and a leg part 40.
  • the seat plate 12, the upper support 20 and the lower support 50 of the leg part 40 are firmly secured, thereby making it difficult for them to be loosened by vibrations created during a performance and by the movement of the performer's body, etc.
  • the seat 11 includes a seat surface 13 of a suitable cushion body which is disposed on the surface of the seat plate 12.
  • the seat is held from the underside of the seat plate 12 by the upper support 20.
  • FIGS. 2 and 3 show an upper support receiving part 14 on the underside of the seat plate 12. Installation screw 19 installs the seat plate 12 on the seat surface 13.
  • the upper support receiving part 14 is formed approximately in the shape of a split or half tube that cooperates with a holder 15 to clamp against opposite sides of the top of the upper support 20.
  • the part 14 is a stationary part of the underside of the seat plate 12 and is at one side of the post of the upper support 20.
  • the part 14 has opposite end parts that extend away from opposite sides of the post 20.
  • a holder 15 is opposite the part 14 and is movable toward and away from the part 14.
  • the holder 15 also has opposite end parts that extend away from opposite sides of the post 20.
  • the respective end parts of the part 14 and of the holder 15 are opposite each other.
  • a first screw 16 extends between the part 14 and the holder 15 and is located at the end parts on the fixed side and a second screw 17 extends between the part 14 and the holder 15 at the end parts located on the tightening side.
  • the holder 15 clamps to and supports the top part of the upper support 20 acting together with the upper support receiving part 14.
  • the holder 15 has a concave part 15a on its inner side which extends along the outer surface of the upper support 20.
  • the holder 15 is either tightened or loosened, as compared with the upper support receiving part 14, by the fixed side screw 16 and the tightening side screw 17.
  • the fixed side screw 16 is comprised of a bolt 16a having a head end that is buried in the upper support receiving part 14.
  • An adjusting nut 16b at the other end is for determining the position of the holder 15 beforehand in conformity with the diameter of the upper support 20 for installation.
  • a spring 16C applies tension to the screw connection and blocks screw rotation.
  • Graduations M on the reverse side of the seat plate 12, as shown in FIG. 5 show the shifted position of the holder 15 in conformity with the diameter of the top of the upper support 20. If the position of the holder 15 is determined according to the diameter of the support 20, and the fixed side screw 16 is tightened, the installation to the upper support 20 of the seat 11 becomes simple and accurate.
  • the tightening side screw 17 comprises a bolt 17a having a head at the part 14 and a nut 17b tightened onto the bolt. Its purpose is to tighten the upper support receiving part 14 and the holder 15 against the top of the upper support 20 that has been inserted between the parts 14 and 15 for fixing them together.
  • a spring 17c maintains tension on the screw for avoiding rotation.
  • the top part of the upper support 20 is inserted between the upper support receiving part 14 and the holder 15, which are then tightened together by the tightening side screw 17, thereby being held freely detachably.
  • FIG. 6 shows a shaking prevention bush 30 fixed at the bottom of the upper support 20. It is installed in the inner tubular part 51 of the lower support 50.
  • the purpose of the shaking prevention bush 30 is to prevent mutual shaking, even when the fixation of the upper support 20 and of the lower support 50 have been loosened.
  • This shaking prevention bush 30 is installed at the bottom of the solid upper support 20 and is fixed there by a screw N.
  • the shaking prevention bush 30 comprises an approximately tubular shaped body having a plurality of cut grooves 31 extending in its longitudinal direction so that the bush is divided and in axial direction strips, and the bush has a compressible part 32 pressed to the inner tube 51 near the tip of the post of the upper support.
  • the divided nature of the bush 30 permits the shaking prevention bush 30 to be inserted, even if there is some bead on the inner diameter of the inner tubular part 51 of the lower support 50.
  • the compressive part 32 of the bush 30 prevents shaking of the upper support 20 as the part 32 contacts the inner peripheral surface of the tubular part 51 where this shaking prevention bush 30 has been inserted into the inner tubular part 51 together with the upper support 20.
  • the bush 30 is formed with a tapered surface that expands outward. The expansion of the tapered surface is formed such that the bottom of the bush may become slightly larger than the inner diameter of the inner tubular part of the lower support 50. As a result, the compressive part 32 tightly adheres to the inner surface of the inner tube part 51, thereby better preventing the shaking.
  • the leg part 40 includes the lower support 50 equipped with a central leg part 70 and leg 45.
  • the leg part 70 has the conventional construction.
  • the lower support 50 includes an inner tubular part 51 into which the upper support 20 is inserted. This fixes the upper support 20 at a desired location. As is shown in FIG. 6, a nut 52 is provided at the top of the inner tubular part 51. The inner peripheral surface of the nut 52 is screw threaded at 53 to engage with the spiral thread of the screw 23 on the outer surface of the upper support 20. As the upper support 20 is rotated to the right or to the left, the upper support 20 is moved in or out of the inner tubular part 51, while being screwed by rotation of the nut 52, so that the height of the chair or seat may be changed.
  • the height of the chair 10 is fixed by an adjusting member 54 that is provided on the lower side of the nut 52, after height adjustment has been performed using the nut 52.
  • the adjusting member 54 comprises a tubular body positioned around the inner tubular part 51, with a tightening member 55 accommodated in the member 54.
  • the tightening member 55 is a tubular body having a longitudinally splined surface 57 that fits the splined bore 56 provided on the inner peripheral surface of the adjusting member 54.
  • the member 55 is integrally fixed by a spring pin 58 which is provided on the inner surface of the adjusting member 54.
  • a cut groove 59 is formed along the longitudinal direction of the inner tubular part 51 on one side of the tightening member 55. As the cut groove 59 is pressed by a tightening bolt 56a, the upper support 20 is fixed to the lower support 50.
  • the material of the tightening member 55 is preferably nylon.
  • the tightening bolt 56a is loosened, which releases the fixing of the upper support 20 to the lower support 50.
  • the seat 11 is rotated to bring the seat surface 13 to the desired height.
  • the tightening bolt 56a is tightened once again to integrally secure the upper support and the lower support 50.
  • the shaking prevention mechanism for the drum chair avoids the possibility that the tightening screw that fixes the seat plate might loosen, which would produce shaking of the chair. That loosening might be caused by movement of the performer on the seat surface, or by the vibrations created by the drum, etc.
  • a shaking prevention bush is installed at the bottom of the upper support so as to compressively contact the inner peripheral surface of the inner tubular lower support part. This avoids the possibility of shakiness even if the fixtures between the two supports themselves might become loosened.

Landscapes

  • Special Chairs (AREA)
  • Chair Legs, Seat Parts, And Backrests (AREA)
  • Chairs Characterized By Structure (AREA)
  • Vibration Prevention Devices (AREA)
US08/779,169 1996-05-28 1997-01-06 Mechanism for preventing the shaking of a drum chair Expired - Lifetime US5842742A (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP8-157670 1996-05-28
JP8157670A JP3062085B2 (ja) 1996-05-28 1996-05-28 ドラム椅子のがたつき防止機構

Publications (1)

Publication Number Publication Date
US5842742A true US5842742A (en) 1998-12-01

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US08/779,169 Expired - Lifetime US5842742A (en) 1996-05-28 1997-01-06 Mechanism for preventing the shaking of a drum chair

Country Status (3)

Country Link
US (1) US5842742A (ja)
JP (1) JP3062085B2 (ja)
TW (1) TW298774U (ja)

Cited By (14)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5927810A (en) * 1998-07-23 1999-07-27 Hwa Hsin Musical Instrument Co., Ltd. Adjustable musician's chair
US6568757B2 (en) * 2001-06-08 2003-05-27 Ming Chuan Lin Control device for seat post of office chairs
US20030164636A1 (en) * 2002-03-01 2003-09-04 Worledge David H. Apparatus and method for providing a portable variably positionable seating device
US20040136775A1 (en) * 2003-01-15 2004-07-15 Jung-Pin Chang Tripod joint
US6893097B1 (en) * 2003-07-07 2005-05-17 Alan H. Ebensperger Outdoor stool system
US20070012848A1 (en) * 2005-07-18 2007-01-18 Tsun-Chi Liao Anchoring fixture for stools capable of adjusting elevation
US20090200845A1 (en) * 2003-08-19 2009-08-13 Gloeckl Josef Chair or Stool Comprising Mobile, Elastic Legs, Permitting a Dynamic Sitting Position
US20100295350A1 (en) * 2008-12-18 2010-11-25 Daniel Seth Barman Ergonomic musician's stool
CN101961173A (zh) * 2010-08-31 2011-02-02 苏州星岛金属制品有限公司 一种凳子
CN104188404A (zh) * 2014-08-18 2014-12-10 常熟市福达红木家具厂 一种折叠椅
US10206509B1 (en) * 2017-11-09 2019-02-19 Tsun-Chi Liao Rapid fixing structure for height adjusting rod of musical instrument chair
CN109363408A (zh) * 2018-11-09 2019-02-22 合肥全爱家居制造有限公司 一种可调节高度的换鞋凳
CN109770596A (zh) * 2019-02-28 2019-05-21 苏州中誉智骏企业管理有限公司 一种舞台表演用座椅
US10960281B2 (en) * 2019-06-10 2021-03-30 Webster Lowe Transportable rowing device

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP3894689B2 (ja) * 1999-10-15 2007-03-22 積水樹脂株式会社 簡易ベンチ
JP4729551B2 (ja) 2007-10-04 2011-07-20 本田技研工業株式会社 アキシャルギャップ型モータ

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2254973A (en) * 1940-04-19 1941-09-02 Charles R Nalle Adjustable caster construction
US3183861A (en) * 1963-05-02 1965-05-18 American Metal Works Inc Stools
US4828212A (en) * 1987-05-18 1989-05-09 Faultless Doerner Manufacturing Inc. Means for adjusting the vertical height of the seat of a chair
US4856929A (en) * 1987-10-21 1989-08-15 Steccone Products Co. Interior clamping device for tubular poles
US4872635A (en) * 1986-04-10 1989-10-10 Steelcase Inc. Slip connector for weight actuated height adjustors
US5040758A (en) * 1989-04-21 1991-08-20 Giovannetti F Level adjustment device, particularly for furniture

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2254973A (en) * 1940-04-19 1941-09-02 Charles R Nalle Adjustable caster construction
US3183861A (en) * 1963-05-02 1965-05-18 American Metal Works Inc Stools
US4872635A (en) * 1986-04-10 1989-10-10 Steelcase Inc. Slip connector for weight actuated height adjustors
US4828212A (en) * 1987-05-18 1989-05-09 Faultless Doerner Manufacturing Inc. Means for adjusting the vertical height of the seat of a chair
US4856929A (en) * 1987-10-21 1989-08-15 Steccone Products Co. Interior clamping device for tubular poles
US5040758A (en) * 1989-04-21 1991-08-20 Giovannetti F Level adjustment device, particularly for furniture

Cited By (16)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5927810A (en) * 1998-07-23 1999-07-27 Hwa Hsin Musical Instrument Co., Ltd. Adjustable musician's chair
US6568757B2 (en) * 2001-06-08 2003-05-27 Ming Chuan Lin Control device for seat post of office chairs
US20030164636A1 (en) * 2002-03-01 2003-09-04 Worledge David H. Apparatus and method for providing a portable variably positionable seating device
US20040136775A1 (en) * 2003-01-15 2004-07-15 Jung-Pin Chang Tripod joint
US6893097B1 (en) * 2003-07-07 2005-05-17 Alan H. Ebensperger Outdoor stool system
US8020938B2 (en) * 2003-08-19 2011-09-20 Gloeckl Josef Chair or stool comprising mobile, elastic legs, permitting a dynamic sitting position
US20090200845A1 (en) * 2003-08-19 2009-08-13 Gloeckl Josef Chair or Stool Comprising Mobile, Elastic Legs, Permitting a Dynamic Sitting Position
US20070012848A1 (en) * 2005-07-18 2007-01-18 Tsun-Chi Liao Anchoring fixture for stools capable of adjusting elevation
US7234781B2 (en) * 2005-07-18 2007-06-26 Tsun-Chi Liao Anchoring fixture for stools capable of adjusting elevation
US20100295350A1 (en) * 2008-12-18 2010-11-25 Daniel Seth Barman Ergonomic musician's stool
CN101961173A (zh) * 2010-08-31 2011-02-02 苏州星岛金属制品有限公司 一种凳子
CN104188404A (zh) * 2014-08-18 2014-12-10 常熟市福达红木家具厂 一种折叠椅
US10206509B1 (en) * 2017-11-09 2019-02-19 Tsun-Chi Liao Rapid fixing structure for height adjusting rod of musical instrument chair
CN109363408A (zh) * 2018-11-09 2019-02-22 合肥全爱家居制造有限公司 一种可调节高度的换鞋凳
CN109770596A (zh) * 2019-02-28 2019-05-21 苏州中誉智骏企业管理有限公司 一种舞台表演用座椅
US10960281B2 (en) * 2019-06-10 2021-03-30 Webster Lowe Transportable rowing device

Also Published As

Publication number Publication date
TW298774U (en) 1997-02-21
JPH09313303A (ja) 1997-12-09
JP3062085B2 (ja) 2000-07-10

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